I beg to differ. The 24-70 f/4L IS will go nicely with the 70-200 f/4L IS. Only 24-70 2.8L II goes nicely with the 70-200 f/2.8L IS II. You have to match your lenses or they will feel uncomfortable

Does not make any sense to me. I have various lenses with various f stops and they all go 'nicely together'.

Neither to me - it depends on what you want. If a shallow dof is required f2.8 on a wider lens is more important than on a tele lens. If the lens is required to be "fast" for low-light shooting it's the other way around.

I beg to differ. The 24-70 f/4L IS will go nicely with the 70-200 f/4L IS. Only 24-70 2.8L II goes nicely with the 70-200 f/2.8L IS II. You have to match your lenses or they will feel uncomfortable

Does not make any sense to me. I have various lenses with various f stops and they all go 'nicely together'.

Neither to me - it depends on what you want. If a shallow dof is required f2.8 on a wider lens is more important than on a tele lens. If the lens is required to be "fast" for low-light shooting it's the other way around.

I beg to differ. The 24-70 f/4L IS will go nicely with the 70-200 f/4L IS. Only 24-70 2.8L II goes nicely with the 70-200 f/2.8L IS II. You have to match your lenses or they will feel uncomfortable

Does not make any sense to me. I have various lenses with various f stops and they all go 'nicely together'.

Neither to me - it depends on what you want. If a shallow dof is required f2.8 on a wider lens is more important than on a tele lens. If the lens is required to be "fast" for low-light shooting it's the other way around.

I beg to differ. The 24-70 f/4L IS will go nicely with the 70-200 f/4L IS. Only 24-70 2.8L II goes nicely with the 70-200 f/2.8L IS II. You have to match your lenses or they will feel uncomfortable

Does not make any sense to me. I have various lenses with various f stops and they all go 'nicely together'.

Neither to me - it depends on what you want. If a shallow dof is required f2.8 on a wider lens is more important than on a tele lens. If the lens is required to be "fast" for low-light shooting it's the other way around.

Hasn't anyone noticed the smile icon in my post ?

I actually agree with this completely. My 2.8 zooms didn't like their 24-105 f/4 adopted cousin (bought used) and he was sold on Craigslist soon after the arrival of the 24-70 II. The newest member of the family is having a rough time fitting in as an f/4 (8-15mm) but he's a special child so the others are a little more accepting... even though he has a tendency to lose his hat (lens cap) for no apparent reason.

I beg to differ. The 24-70 f/4L IS will go nicely with the 70-200 f/4L IS. Only 24-70 2.8L II goes nicely with the 70-200 f/2.8L IS II. You have to match your lenses or they will feel uncomfortable

Does not make any sense to me. I have various lenses with various f stops and they all go 'nicely together'.

Neither to me - it depends on what you want. If a shallow dof is required f2.8 on a wider lens is more important than on a tele lens. If the lens is required to be "fast" for low-light shooting it's the other way around.

Hasn't anyone noticed the smile icon in my post ?

I actually agree with this completely. My 2.8 zooms didn't like their 24-105 f/4 adopted cousin (bought used) and he was sold on Craigslist soon after the arrival of the 24-70 II. The newest member of the family is having a rough time fitting in as an f/4 (8-15mm) but he's a special child so the others are a little more accepting... even though he has a tendency to lose his hat (lens cap) for no apparent reason.

Families just need to learn to deal. My 600/4 II feels a little gangly and self-conscious around the 40/2.8, but that's his problem... You'd think the 40/2.8 and MP-E 65/2.8 would play nicely, being so close in height, but they just can't seem to work at the same distance.

Had a play about with the 24-70 f/4 IS today at a camera store. It feels a bit like a 24-105 but a bit more plasticky. The zoom ring felt quite stiff and didn't move smoothly, could be because its new but it had a courseness to it that i didnt like. There was no card in 6D test camera but from the preview screen the images looked quite sharp. IS was good down to 1/8th second at 70mm! Though i couldnt zoom in to the preview to check sharpness. Macro was fun, I can see this lens being quite popular with 6D users.